One more very good advice. I will do so. Just: sulphur powder not available here. What does the sulphur do, by the way? Can I substitute?

I also wonder, if I could keep these babies (all of them - the ehalthy and diseased ones) in my apartment (700 foot-candles). And if, where? Window? Beside window (1,500 to 2,000 foot-candles)? How many foot-candle do they need? Or should I build a terrarium for them inside my apartment with mist maker and small fan?